> On Fri, May 10, 2019 at 09:57:09PM +0200, Bram Moolenaar wrote:
> > > git bisect finds this. However I tried again and it finds 1265. Perhaps
> > > I need to clean the workspace between each run. So I tried again and it
> > > finds 1265 again. And reverting that patch (including 1-1264, 1266-1312)
> > > the issue is gone.
> > > 
> > > Also I notice that 'set ttymouse=xterm' restores mouse support, although
> > > it was already xterm.
> > 
> > Strange.  So, what is broken, how to reproduce?  Start with "vim
> > --clean".
> 
> That's simple:
> 
> 1. be inside tmux
> 2. vim --clean -c 'set mouse=a'
> 
> The mouse support is not enabled.
> 
> 3. :set ttymouse=xterm
> 
> The mouse support is now enabled.
> 
> tmux 2.9a running inside gnome-terminal 3.32.2 on Arch Linux.
> 
> This is my vim --version:
> 
> VIM - Vi IMproved 8.1 (2018 May 18, compiled May  7 2019 19:54:58)
> Included patches: 1-1290
> Huge version with GTK3 GUI.  Features included (+) or not (-):
> +acl               +extra_search      +mouse_netterm     -tag_old_static
> +arabic            -farsi             +mouse_sgr         -tag_any_white
> +autocmd           +file_in_path      -mouse_sysmouse    -tcl
> +autochdir         +find_in_path      +mouse_urxvt       +termguicolors
> -autoservername    +float             +mouse_xterm       +terminal
> +balloon_eval      +folding           +multi_byte        +terminfo
> +balloon_eval_term -footer            +multi_lang        +termresponse
> +browse            +fork()            -mzscheme          +textobjects
> ++builtin_terms    +gettext           +netbeans_intg     +textprop
> +byte_offset       -hangul_input      +num64             +timers
> +channel           +iconv             +packages          +title
> +cindent           +insert_expand     +path_extra        +toolbar
> +clientserver      +job               +perl/dyn          +user_commands
> +clipboard         +jumplist          +persistent_undo   +vartabs
> +cmdline_compl     +keymap            +postscript        +vertsplit
> +cmdline_hist      +lambda            +printer           +virtualedit
> +cmdline_info      +langmap           +profile           +visual
> +comments          +libcall           +python/dyn        +visualextra
> +conceal           +linebreak         +python3/dyn       +viminfo
> +cryptv            +lispindent        +quickfix          +vreplace
> +cscope            +listcmds          +reltime           +wildignore
> +cursorbind        +localmap          +rightleft         +wildmenu
> +cursorshape       +lua/dyn           +ruby/dyn          +windows
> +dialog_con_gui    +menu              +scrollbind        +writebackup
> +diff              +mksession         +signs             +X11
> +digraphs          +modify_fname      +smartindent       -xfontset
> +dnd               +mouse             +startuptime       +xim
> -ebcdic            +mouseshape        +statusline        -xpm
> +emacs_tags        +mouse_dec         -sun_workshop      +xsmp_interact
> +eval              +mouse_gpm         +syntax            +xterm_clipboard
> +ex_extra          -mouse_jsbterm     +tag_binary        -xterm_save

I'm using the same mouse features, and for me it does not happen.
What is $TERM set to?  It should be "screen" or "tmux".

-- 
The most powerful force in the universe is gossip.

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\  an exciting new programming language -- http://www.Zimbu.org        ///
 \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///

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